Nitrogen-rich azoles as trifunctional electrolyte additives for high-performance lithium-sulfur battery  

作　　者：Dan-Yang Wang Wenmin Wang Fengli Li Xin Li Wei Guo Yongzhu Fu 

机构地区：[1]College of Chemistry,Zhengzhou University,Zhengzhou 450001,Henan,China [2]Hefei National Laboratory for Physical Sciences at the Microscale,University of Science and Technology of China,Hefei 230026,Anhui,China [3]College of Chemistry,Chemical Engineering and Materials Science,Zaozhuang University,Zaozhuang 277160,Shandong,China

出　　处：《Journal of Energy Chemistry》2022年第8期572-579,I0015,共9页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.U2004214,21975225,and 51902293)。

摘　　要：Rechargeable lithium-sulfur(Li-S)batteries are considered one of the most promising energy storage techniques owing to the high theoretical energy density.However,challenges still remain such as the shuttle effect of lithium polysulfides(LPSs)and the instability of lithium metal anode.Herein,we propose to use nitrogen-rich azoles,i.e.,triazole(Ta)and tetrazole(Tta),as trifunctional electrolyte additives for Li-S batteries.The azoles afford strong lithiophilicity for the chemisorption of LPSs.The density functional theory and experimental analysis verify the presence of Li bonds between the azoles and LPSs.The azoles can also interact with lithium salt in the electrolyte,leading to increase ionic conductivity and lithiumion transference number.Moreover,the azoles render particle-like lithium deposition on the lithium metal anode,leading to superlong cycling of a Li symmetric cell.The Li-S batteries with Ta and Tta exhibit the initial discharge capacity of 1425.5 and 1322.2 m Ah g^(-1),respectively,at 0.2 C rate,and promising cycling stability.They also enable enhanced cycling performance of a Li-organosulfide battery.

关 键 词：AZOLE Electrolyte additive Lithium-sulfur battery CHEMISORPTION Organosulfide 

分 类 号：TM912[电气工程—电力电子与电力传动] O626[理学—有机化学]